I read like 3 more pages in Horowski just now and got to the following description of FW2: vom berühmten Onkel Friedrich fast absichtlich zur Unfähigkeit erzogen, die den Vorgänger umso heller strahlen lassen würde, which I translate as "almost intentionally raised by his famous uncle Friedrich to be incapable, which would allow his predecessor to shine all the more brightly." (As always, correct me if necessary.)

Uh huh. I don't think Fritz is upset enough about Jena-Auerstedt to reverse his treatment of FW2.

Also, in pasting your summary of FW2 to Rheinsberg this morning, I was reminded that you'd commented on the difference in the English and German wiki treatments of FW2. Did you notice the banner on the English one reading, "This article may require cleanup to meet Wikipedia's quality standards. The specific problem is: tendentious bias towards militaristic evaluation of frederick william"?

Fritz: That's my tendentious bias, thank you very much. Can I interest you in my opinion on my no-good, money-wasting, flute-playing grandfather?